Delphi HVAC System Simplifies Cab-Design Process

Delphi Automotive's seat-based heating, ventilation and air conditioning (HVAC) system simplifies the cab-design process and minimises equipment assembly while keeping passengers comfortable. The system is part of the E3 HVAC Seat, which combines Delphi's Diavia HVAC application capability with COBO's steering column, seat, lighting, electric and electronic devices. The E3 HVAC Seat will debut this week at COBO's booth at the Conexpo-Con/AGG 2011 exposition, being held at the Las Vegas Convention Center on 22-26 March.

Designed for medium-size vehicle or equipment cabins or small rooms, the E3 HVAC has a cooling capacity of 6.2kW and a heating capacity of 5.8kW. It can provide climate control for the cab only or for the cab and seat cushion by channeling air flow from the vents. By adjusting the vents, the operator can select the most comfortable cab temperature and keep the seat dry. Air is cooled through an evaporator provided with an expansion valve and using the cooling gas from the AC system. Air is warmed using a heater containing the fluid coming from the endothermic motor.

The air is circulated using an electric fan and the air flow is managed by an electronic voltage regulator PWM (pulse width modulator), allowing a linear voltage adjustment at the ends of the fan. Since the seat and HVAC unit are fully integrated, plug-and-play installation is simple and design and assembly time are reduced. Additionally, all climate - functions are incorporated into the new electronic control board with CAN BUS interface, which has been designed for industrial vehicle cabins. This new control unit - built in conformity with ISO 7637 and 2004/104/CE rules - is located inside the seat arm.

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